Where'd you put your keys again?

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Ever walk into a room and forget why you entered? Or completely space out during an important meeting at work? As frustrating as it is, experts say it's actually normal.

Your brain is naturally primed to wander whenever it can, according to a joint study by Harvard University, Dartmouth College, and the University of Aberdeen in Scotland. Using MRI, researchers found that brain regions responsible for "task-unrelated thought" (that is, daydreaming or mind wandering) are almost constantly active when the brain is at rest or performing a task that doesn't require concentration.

Fortunately, brain experts say it's possible to corral that brainpower, filter out distractions, and master any task by improving your concentration. Here are their top tips for refocusing during key moments when your mind starts meandering—but shouldn't.